首页|Plastid phylogenomics and biogeography of the medicinal plant lineage Hyoscyameae (Solanaceae)
Plastid phylogenomics and biogeography of the medicinal plant lineage Hyoscyameae (Solanaceae)
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The cosmopolitan family Solanaceae, which originated and first diversified in South America, is economically important. The tribe Hyoscyameae is one of the three clades in Solanaceae that occurs outside of the New World; Hyoscyameae genera are distributed mainly in Europe and Asia, and have centers of species diversity in the Qinghai-Tibet Plateau and adjacent regions. Although many phylo-genetic studies have focused on Solanaceae, the phylogenetic relationships within the tribe Hyoscyameae and its biogeographic history remain obscure. In this study, we reconstructed the phylogeny of Hyos-cyameae based on whole chloroplast genome data, and estimated lineage divergence times according to the newly reported fruit fossil from the Eocene Patagonia, Physalis infinemundi, the earliest known fossil of Solanaceae. We reconstructed a robust phylogeny of Hyoscyameae that reveals the berry fruit-type Atropa is sister to the six capsule-bearing genera (Hyoscyameae sensu stricto), Atropanthe is sister to the clade (Scopolia, Physochlaina, Przewalskia), and together they are sister to the robustly supported Anisodus-Hyoscyamus clade. The stem age of Hyoscyameae was inferred to be in the Eocene (47.11 Ma, 95％HPD:36.75-57.86 Ma), and the crown ages of Hyoscyameae sensu stricto were estimated as the early Miocene (22.52 Ma, 95％HPD:15.19-30.53 Ma), which shows a close correlation with the rapid uplift of the Qinghai-Tibet Plateau at the Paleogene/Neogene boundary. Our results provide insights into the phylogenetic relationships and the history of the biogeographic diversification of the tribe Hyoscyameae, as well as plant diversification on the Qinghai-Tibet Plateau.
Laboratory of Systematic Evolution and Biogeography of Woody Plants,College of Ecology and Nature Conservation,Beijing Forestry University,Beijing,100083,China
Department of Botany,National Museum of Natural History,MRC 166,Smithsonian Institution,Washington,DC,20013-7012,USA
Key Laboratory of Plant Resources Conservation and Sustainable Utilization,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou,510650,China
This work was supported by the Beijing Natural Science FoundationNational Natural Science Foundation of ChinaChina Scholarship Council
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